<template>
  <div class="login-container">
    <!-- 登录区域 -->
    <div class="login-box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单 -->
      <el-form class="login_form" :model="loginForm" ref="loginFormRef" :rules="loginFormRutes">
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-changyonglianxiren"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-jiesuo"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click='login'>登录</el-button>
          <el-button type="info" @click="resetForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data: function () {
    return {
      // 表单数据
      loginForm: {
        username: '',
        password: ''
      },
      // 表单验证规则
      loginFormRutes: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '密码不能为空', trigger: 'blur' },
          { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重制表单
    resetForm () {
      console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        console.log(res)
        if (res.meta.status !== 200) {
          return this.$message({
            message: '登录失败',
            type: 'error'
          })
        }
        this.$message({
          message: '登录成功',
          type: 'success'
        })
        // 1 登录成功之后的 token,保存到客户端的 sessionStorage中
        //    1.1 项目中除了登录之外的其他API接口,必须在登录之后才能访问
        //    1.2 token 只应在当前网站打开期间生效,所以将 token 保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 2 通过编程式导航跳转到后台主页,路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login-container {
  background-color: #2b4b6b;
  height: 100%;
  position: relative;
}
.login-box {
  position: absolute;
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 5px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    box-shadow: 0 0 15px rgba(0, 0, 0 0.5);
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 15px;
  box-sizing: border-box;
}
</style>
